330 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
4. Syringopora reticulata Hisinger. 
5. Whitfieldella didyma. 
6 prunum. 
7. Rhipidomella hybrida. 
8. Murchisonia cingulata Hisinger. 
9. Platyschisma helicites (Sowerby). 
10. Pleurotomaria undata Sowerby. 
11. Holopella obsoleta Sowerby. 
12. Jlionia prisca (Hisinger). 
13. Pterinea retroflexa Wahlenberg. 
14. Orthoceras imbricatum Wahlenberg. 
15. Leperditia baltica. 
16. Encrinurus? obtusus Angelin. 
17. Eurypterus fischeri Eichwaldi. 
The exposures northwest of Arensburg and on the west coast are 
rarely extensive, consisting of small quarries in the interior and a few 
low cliffs on the coast. 
Padel, about nine miles from Arensburg and on the road to Rotzikiill, 
has an exposure of fully four feet of very finely crystalline limestone 
which in fresh exposures is probably thick-bedded, but under the 
action of sun and frost the rock separates into thin slabs. The fauna 
is the same as that at Sagaristi, and Whitfieldella didyma is the most 
common fossil. About a mile west of Padel is the Koggul quarry. 
The elevation is in the neighborhood of ten feet higher and the beds 
may be a little higher stratigraphically, but there is no certainty re- 
garding this point. About ten feet of thick-bedded, chocolate colored 
limestone are exposed. Fossils are not abundant; but large omphalo- 
trochoid gastropods and small W hitfieldella didyma are not uncommon. 
Other fossils from here are Crotallocrinus rugosus Miller, Aviculopecten 
danbyt (McCoy), Goniophora cymbaeformis Sowerby, Megalomus 
gothlandicus Lindstrém, and Encrinurus punctatus. A form closely 
related to Eospirifer radiatus also occurs at this locality. Another 
small quarry at Limadau exposes about two feet of very hard compact 
limestone containing hardly any fossils. 
Rotzikiill is the noted eurypterid locality, made famous through 
the labors of Schmidt, Holm, and others, and which has long been the 
European Mecca for students of this group of organisms. The eury- 
pterid layer is well exposed in a small quarry on the shore to the south 
of the village and the base of the quarry is from six to eight feet above 
sea-level. At the base are eighteen inches of white fine-grained 
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